WTB: I , O 901 gear

[preS]

I would like to buy an I for 3rd and an O for 4th in good / excellent condition.

Please PM or email me if you have one you can sell.

Richard

[jhora]

Richard...checking my stock for an "O"....

[PCA7GGR]

PM set - I have two sets.

[jhora]

Have one excellent "O" matched set...let me know

[ajwans]

Have one excellent "O" matched set...let me know

That's an 3rd gear O.

andy

[YTNUKLR]

Most O's are 3rd. Those cannot be used for 4th, Richard needs a 4th-O.

[jhora]

what's the difference....can't it be used for 3.4,or 5...thanks

[YTNUKLR]

Different bearing sizes.

A 3rd can run as a 3rd or flipped as a 4th or a 5th.

A 4th can be run as a 4th or a 5th.

A 5th can be run as a 4th or a 5th.

A 4th can be flipped to 3rd.

A 5th can be flipped to 3rd.

An "O" 23:28 3rd turns into a "Y"28:23 4th/5th when flipped!

A recommendation to Richard - maybe get a ZD 5th 31:22 (from 914) and flip to 3rd, makes "Ka" (in between K and L)

A great 901 box is a A-F-Ka-Q-X...lots more fun on street than A-F-M-S-X...with smaller engines...

just a suggestion...

[ajwans]

No, a if you have a couple of 4/5 gears there you will see straight away
why they can't go into third in the intended ratio. They can be flipped into
3rd but then the ratio is inverted and the helical cuts transmit the thrust
in the opposite direction from what the designed intended.

There is debate over whether the thrust on a flipped gear constitutes a problem.
Nevertheless the gear ratio is inverted so you can't use a 3rd O as a 4th O,
it would become a 4th Y.

A ZD when flipped is pretty close to a K, some people call it a KA although I don't
believe any factory designation existed. KA can be a reasonably short 3rd gear,
albeit not as short as the I 3rd you want. I = 1.55, KA = 1.41.

andy

[jhora]

Thanks guys!